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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Changing Speed Control of Turbine System in Operation Condition of Ultrahigh Drain Pressure
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Changing Speed Control of Turbine System in Operation Condition of Ultrahigh Drain Pressure

机译：超高压排水工况下汽轮机系统的变速控制

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Open loop thermal cycle turbine engine system is very fit for modem high speed autonomous under water vehicle (AUV) because of its good performance and simple system structure. But this power system can't keep its stability when it works in the condition of ultrahigh drain pressure. In order to guarantee the security of vehicle system, the phenomena of pressure overshoot and dithering in combustion chamber is not allowed to occur in the speed changing process of engine. Such a behavior and control request makes the control of turbine engine propeller system an acknowledged difficult problem especially when an AUV voyages in super deep seawater. The open loop control system used normally, which is based on the pressure control valves or flow control valves, can't satisfy the control performance request of modern AUV. In this paper,a system mathematics model was built, the instability was analyzed and a closed-loop control system was built with a power control unit and a variable displacement piston fuel pump. It is difficult to design a control algorithm aiming at the displacement of fuel pump directly because there is not one-to-one corresponding relationship between the displacement of fuel pump and output power or rotating rate of system. By utilizing slight inertia characteristics of control executing machine and pressure of combustion chamber, the control law aiming at the propellant consumption was designed instead of the usual control law of adjusting capacity of variable capacity fuel pump. Combining the control law with the feedback rotating rate of host shaft, the pump control signal, or the displacement of fuel pump was gotten indirectly. This control algorithm is robust and simple to realize. In order to restrain the pressure overshoot and dithering of combustion chamber, the high response speed servo valve was used for the angle driver mechanism of variable displacement piston fuel pump, and the servo electromotor was substituted. The closed loop control system which was built with these aforementioned measures can control rotating rate of system and vehicle speed exactly. The transition processes of combustion chamber pressure, system rev rate and vehicle speed are smooth, quick and exact when the speed changes. There is no pressure overshoot or dithering. The security of system is ensured. The control system would be regulated easily and could be used for engineering practice immediately. Meanwhile advantage of this kind of closed control system was proved by semi-physics simulation test.
机译：开环热循环涡轮发动机系统由于其良好的性能和简单的系统结构，非常适合现代高速水下航行器（AUV）。但是，在超高排水压力下工作时，该电源系统无法保持其稳定性。为了保证车辆系统的安全性，不允许在发动机的变速过程中发生燃烧室内压力过大和抖动现象。这种行为和控制要求使得涡轮发动机螺旋桨系统的控制成为公认的难题，尤其是当AUV在超深海水中航行时。通常使用的基于压力控制阀或流量控制阀的开环控制系统无法满足现代AUV的控制性能要求。本文建立了系统数学模型，分析了系统的不稳定性，并建立了带有功率控制单元和可变排量活塞燃油泵的闭环控制系统。直接针对燃油泵的排量设计控制算法比较困难，因为燃油泵排量与系统输出功率或系统转速之间没有一一对应的关系。利用控制执行机的微小惯性特性和燃烧室压力，设计了针对推进剂消耗的控制规律，代替了通常的可变容量燃油泵调节能力的控制规律。将控制规律与主动轴的反馈转速，泵控制信号或燃​​油泵排量相结合。该控制算法是鲁棒的并且易于实现。为了抑制燃烧室的压力超调和抖动，将高响应速度伺服阀用于可变排量活塞燃油泵的角度驱动机构，并代之以伺服电动机。利用上述措施构建的闭环控制系统可以精确控制系统的转速和车速。当速度变化时，燃烧室压力，系统转速和车速的过渡过程平稳，快速且精确。没有压力超调或抖动。确保了系统的安全性。该控制系统易于调节，可立即用于工程实践。同时通过半物理仿真试验证明了这种闭环控制系统的优势。

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